Primula plants, also known as primroses, are partially hardy perennials commonly grown as annual plants in the garden, as many varieties do not tolerate cold temperatures or winter conditions. The plants produce rosette-style flowers that may have bell-shaped, tubular or flat blossoms anytime from late winter through the summer months depending on the variety. The Primula plant prefers a moist soil and does well in boggy areas, as a border plant or in rock gardens.
Choose a garden planting location that has a well-draining soil and partly shaded light conditions. Test the soil with a home pH soil test kit as Primula plants prefer a slightly acidic soil with a pH of approximately 6.5. Add ground rock sulfur to the soil to lower the soil pH number or limestone to raise the soil pH number.
Plant Primula plants in the garden in early spring. Wait two weeks to plant in soil that has been altered with ground rock sulfur or limestone. Plant the Primula in the ground so the crown is placed at soil level. Space the plants 6 inches or more apart from each other.
Fertilize the plants by working fish or blood meal or composted manure into the soil around the plants in the spring season before flowering. Avoid chemical fertilizer as they are too harsh for the plants. Water the plants well after applying fertilizer.
Water the Primula plants in the spring and summer months so the soil remains moist. The plant prefers wet soil over dry conditions and should be watered regularly during the dry summer months when the rainfall amounts are less than an inch per week.
Propagate Primula plants grown indoors or in warm climates after the blooming period is complete. Remove the plant from the potting container or ground and divide the roots to create additional plants.